I had that problem too with my first born son but it was opposite with me. He sleeps so well during day time but at night he would sleep for 2 or 3 hours then he would wake up and stay awake till almost four am. This went on almost every night till he was 13 months old. He is so energetic at night. I would rather have him stay awake all day during day time and sleep well at night. Then when my first born son was 14 months old I gave birth to another son. This time his brother was different. His baby brother hardly sleep during day time and at night he sleeps so well.